Improvement in printing-telegraphs



T. A. EDISON.

Improvement in Printing-Telegraphs.

No. 131,339, Patented Sep.17,1872.

- m vmwon Witnesses. W W

U nrrnn STATES PATENT! OFFICE.

THOMAS A. EDISON, OF NEWARK, NEW JERSEY.

IMPROVEMENT IN I PRlNTlNG-TELEGRAPHS.

Specification forming part of Letters Patent No. 131,339 dated September17, 1872.

To all whom it may concern:

Be it known that I, THOMAS A. Enrsoiv, of Newark, in the county of Essexand State of New Jersey, have invented an Improvement inPrinting-Telegraphs and the following is declared to be a correctdescription of the same.

In this telegraph there are two typewheels, two printing levers, andcontiguous printingpads, and there is a separate magnet to eachprinting-lever. The step-by-step movement revolves the type-wheel, andthere is a half-space moved by the pallets when the circuit to theprintingmagnet is closed, and the other half space is moved at thereverse movement of the armature away from the magnet. The type-wheelsare positioned so that the letters in one are in line with the spacesbetween the letters in the other. An arm is provided that vibrates withthe armature of the typewheel magnet, and acts as a circuit-closer, sothat when the type-wheels are stoppedwith the armature drawn toward thetype-wheel magnet this circuit-closing arm will complete the circuit tothe magnet that acts upon the proper printing-lever. The circuit to theother printing-lever is closed by the rising of the armature from thetype-wheel magnet. This instrument is adapted to printing letters fromone type-wheel, and numbers and fractions from the other wheel, andeither can be brought into action at any time, the letters being inposition with a closed circuit, and the numbers in position with theopen circuit through the type-wheel magnet, or the reverse. Twoline-wires, of course, are required-tooperate a number of instruments;one goes through the type-wheel magnets and the other through theprintin g-magnets.

istics of this machine are the same as those heretofore described by mein other applications for patents, except in the particulars hereafterdescribed.

In the drawing, Figure 1 is a plan, and Fig.

The generalcharacter- 2 is a detached sectional view of my improvedinstrument.

The type-wheel magnet h is in the electric circuit to the line-wires 26.Its armature l acts upon the levers h and pallets ito move the toothedwheel k, shaft g, and type-wheels Z L half a space on the type-wheels asthe circuit is closed through h, and the other half as the circuit isbroken and the armature retracted by a spring. The spring-arm 45 is uponthe shaft 6, and moved at the same time as the armature Z, and playsbetween the circuit-closers 3 and 4. When the circuit through h isclosed one character on the type-wheel I will be in line for printing,and the spring 45 will close the circuit from 27 through the magnet m,closer 4, spring 45, shaft 6, frame f, bed f, and binding-screw 28 tothe line; hence, the lever m will be operated to impress from thetype-wheel l and by the clamp and pawl u v and lever c to feed the paperas soon as a pulsation is sent through 27. If the typewheels are stoppedwith'circuit through hbroken, the circuit-closer 45 will be in contactwith 3; hence, a pulsation through 27 will pass by the magnet m 4,closer 3, spring 45, shaft 6, frame and bed-f f to 28, and operate theprinting-lever m and give an impression from the type-wheel Z, and bythe clamps and pawls o u and lever 12 feed the paper. By this anrangement either type-Wheel can beprinted from at pleasure, and thereare not any partsto shift or change.

-I claim as my invention- The circuit-closing arm 45 and connections 3 4to the respective magnets m on, in-combination with the printing-leversm m typewheels I Z and actuating mechanism, sub-' stantially as setforth.

Signed by me this 29th day of J une, A. D. 1872.

Witnesses: T. A. EDISON.

GEO. T. PrNcKNEY, CHAS. H. SMITH.

